Deuteronomy 13:15-17

CLV(i) 15 then you shall smite, yea smite the dwellers of that city with the edge of the sword. Doom it, all those who are in it and its domestic beasts, with the edge of the sword. 16 All its loot shall you get together to the middle of its square, and you will burn the city with fire and all its loot as a holocaust to Yahweh your Elohim. It will become an eonian barrow; it shall not be built again. 17 Nothing whatsoever shall cling to your hand from the doomed loot so that Yahweh may turn back from the heat of His anger and be compassionate to you. He will show you compassion and cause you to increase, just as He had sworn to your fathers,